backup HD

hello

today I got a new secondary 40 GBs HD that I plan using for backup

my primary HD has 80 GBs (15 used) and is splitted in many partitions:
/usr, /boot, /tmp, /home, etc...

i know the main thing I should backup is the "/home" dir
but what else should I backup (backups will be done daily with rsync, not compressed of course) in order to, supposing I have a problem with primary HD, I just need to boot with the secondary HD?

i just require the minimum necessary (httpd, ftpd, pop/smtp, named)... cpanel is not needed

has anyone already done that?

thanks

 

 

 

 

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